package test;

public class demo4 {
    //多线程增同一变量
    public static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        Object locker = new Object();
        Thread t1 = new Thread(()->{
            synchronized (locker){
                for(int i = 0; i < 500; i++){
                    count++;
                }
            }
        });
        Thread t2 = new Thread(()->{
            synchronized (locker){
                for(int i = 0; i < 500; i++){
                    count++;
                }
            }

        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count);
    }
}
